When that boss is defeated first time, you can make another clone to appear, but more aggressive, like shooting laser alongside with spreading bullets and fast movement. Plus extended health (for original one i chose 5000 units of health, and for enraged clone i chose 7000 units of Health)

For Eyes enraged clone i chose flesh texture with center radial gradient (credit goes to textures.com, link is https://www.textures.com/download/meat-0016/56199)

i forgot to switch boss music